from rest_framework import serializers

from goods.models import SKU


class CartSerializer(serializers.Serializer):
    """购物车"""

    sku_id = serializers.IntegerField(label='商品id', min_value=1)
    count = serializers.IntegerField(label='购买数量', min_value=1)
    selected = serializers.BooleanField(label='商品勾选状态', default=True)

    def validate_sku_id(self, value):

        try:
            SKU.objects.get(id=value)
        except SKU.DoesNotExist:
            raise serializers.ValidationError('SKU 不存在')
        return value


class CartSKUSerializer(serializers.ModelSerializer):
    # 购物车查询

    count = serializers.IntegerField(label='购买数量')
    selected = serializers.BooleanField(label='商品勾选状态')

    class Meta:
        model = SKU
        fields = ['id', 'name', 'default_image_url', 'price', 'count', 'selected']


class CartDelSerializer(serializers.Serializer):
    """购物车删除"""
    sku_id = serializers.IntegerField(label='商品id', min_value=1)

    def validate_sku_id(self, value):

        try:
            SKU.objects.get(id=value)
        except SKU.DoesNotExist:
            raise serializers.ValidationError('SKU 不存在')
        return value


class CartSelectAllSerializer(serializers.Serializer):
    """购物车的全选"""
    selected = serializers.BooleanField(label='全选')
